Cartridge tank



FIG. 1 is a front view of a cartridge tank showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a plan view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines depict portions of the cartridge tank that form no part of claimed design. 

CLAIM We claim the ornamental design for a cartridge tank, as shown and described. 